I liked how you implemented the health system to increase the pressure in the game!
I wonder if you're planning to make regaining health possible. Are there any plans for that?
Finally, I have a game suggestion for you to check out. Its name is Card Hog. Although the core mechanics of your game and Card Hog are different, I think there are some aspects of that game you can inspire from. For example, although the game is endless, there are lots of environmental objectives to complete so the game is more interesting!
I hope you have a happy holiday!